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Factor out error message to IM_PADDING_CHECK_FAIL_MSG and check the padding on ImVec4

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Brayden Lee 2025-12-23 16:30:36 -05:00
parent 4b022e571c
commit 60a6c7be98
1 changed files with 8 additions and 2 deletions
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10
imgui.h
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@ -152,6 +152,10 @@ Index of this file:
#pragma GCC diagnostic ignored "-Wclass-memaccess" // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead #pragma GCC diagnostic ignored "-Wclass-memaccess" // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
#endif #endif
#define IM_PADDING_CHECK_FAIL_MSG(TypeName) "Cannot compile "## #TypeName ##" due to an padding assumption violation. \
Please reply to (or start) the issue with your compiler version and flags at https://github.com/ocornut/imgui/issues."
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
// [SECTION] Forward declarations and basic types // [SECTION] Forward declarations and basic types
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
@ -303,8 +307,7 @@ struct ImVec2
IM_VEC2_CLASS_EXTRA // Define additional constructors and implicit cast operators in imconfig.h to convert back and forth between your math types and ImVec2. IM_VEC2_CLASS_EXTRA // Define additional constructors and implicit cast operators in imconfig.h to convert back and forth between your math types and ImVec2.
#endif #endif
}; };
static_assert(offsetof(ImVec2, y) - offsetof(ImVec2, x) == sizeof(float), "Cannot compile ImVec2 due to an alignment/padding violation.\ static_assert(offsetof(ImVec2, y) - offsetof(ImVec2, x) == sizeof(float), IM_PADDING_CHECK_FAIL_MSG(ImVec2));
Please reply to (or start) the issue with your compiler version and flags at https://github.com/ocornut/imgui/issues.");
// ImVec4: 4D vector used to store clipping rectangles, colors etc. [Compile-time configurable type] // ImVec4: 4D vector used to store clipping rectangles, colors etc. [Compile-time configurable type]
struct ImVec4 struct ImVec4
@ -316,6 +319,9 @@ struct ImVec4
IM_VEC4_CLASS_EXTRA // Define additional constructors and implicit cast operators in imconfig.h to convert back and forth between your math types and ImVec4. IM_VEC4_CLASS_EXTRA // Define additional constructors and implicit cast operators in imconfig.h to convert back and forth between your math types and ImVec4.
#endif #endif
}; };
// It is guaranteed that struct fields are in order of declaration, i.e. addressof(x) < addressof(y) < addressof(z) < addressof(w)
// This check uses the guarantee to ensure our padding assumption is correct for all members with only one comparison (concise, less error-prone).
static_assert(offsetof(ImVec4, w) - offsetof(ImVec4, x) == 3 * sizeof(float), IM_PADDING_CHECK_FAIL_MSG(ImVec4));
IM_MSVC_RUNTIME_CHECKS_RESTORE IM_MSVC_RUNTIME_CHECKS_RESTORE
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------